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Accounting Policies (Details) (USD $) In Billions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Fair Value of Financial Instruments
Minimum initial maturities of short-term investments (in months)	3 months
Total long-term debt	$ 9.4
Estimated fair value of long-term debt	$ 10.7

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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